Finding the Third Proportional to 218.50 and 333.38

Step by Step Solution

1. Step 1: Write the proportion equation
   218.50 : 333.38 = 333.38 : x
2. Step 2: Convert to fraction form
   218.50/333.38 = 333.38/x
3. Step 3: Cross multiply
   218.50x = 333.38 × 333.38
4. Step 4: Simplify right side
   218.50x = 111,138.89
5. Step 5: Solve for x
   x = 111,138.89/218.50
6. Step 6: Final answer
   x = 508.64